Duties:

Executive officer, second-in-command, just below the captain

Post Holders:

- T'Pol (Enterprise NX-01)
- Una Chin-Riley (USS Enterprise)
- Spock (USS Enterprise & USS Enterprise-A)
- William T. Riker (USS Enterprise-D & USS Enterprise-E)
- Kira Nerys (Deep Space 9 & USS Defiant)
- Aaron Cavit (USS Voyager)
- Chakotay (USS Voyager)
- Jack Ransom (USS Cerritos)
- Adreek-Hu (USS Protostar)
- Tysess (USS Dauntless & USS Voyager-A)
- Raffaela Musiker (USS Enterprise-G)
- Ducane (USS Relativity)
- Rayner (USS Discovery)